Tiger Small Engine
Lawn Addict
Yep, leak down test is the next step. Hydraulic lifters, no hour meter, 19 year old engine. Both my leak down tester gauges broke. Guess I have to buy another one.
Kohler Command Pro Single Cylinder Horizontal Lifter issue
- Thread starter smallengineguy
- Start date
smallengineguy
Member
That worked! I left the intake wide open/compressed over night and came out today and it started and ran. Sometimes the basic things work! Thanks VegetiveSteam.
VegetiveSteam
Well-Known Member
You’re welcome. Glad it worked. Hopefully it lasts.
grumpyunk
Well-Known Member
The lifter was not allowing the oil to bleed when valve pressure was removed from the pushrod. The internals are supposed to move freely, and open the 'capture' chamber so oil can relieve the pressure. When the lobe starts to push on the lifter base, the insides move and close the relief valve and capture a slug of oil. That slug is what makes the insides solid with the lifter body, and thus able to push on the push rod. If the oil gets captured and is not allowed to escape when pressure is relieved, it may pump up and hold the valve open.
Essentially, the lifter was sticking so oil could not leak out(likely to go up the push rod). It broke free and started moving again.
If you look in the Kohler shop manual, it indicates some valves are adjustable, and the clearance must be measured with the lifter bled down completely, The retainer is then tightened to the point a specificed clearance is reached. I do think the procedure is for older models. But, what is an 'older' model? The newer models use the tighen to x.xinch/lb adjustment.
tom
Essentially, the lifter was sticking so oil could not leak out(likely to go up the push rod). It broke free and started moving again.
If you look in the Kohler shop manual, it indicates some valves are adjustable, and the clearance must be measured with the lifter bled down completely, The retainer is then tightened to the point a specificed clearance is reached. I do think the procedure is for older models. But, what is an 'older' model? The newer models use the tighen to x.xinch/lb adjustment.
tom
grumpyunk
Well-Known Member
Either intermittent valve sticking in the guide, or hydraulic lifter pumping up and not letting the intake valve seat could cause back puffs.
Have you checked the cooling fins for any sort of blockage such as clippings or nests? Has the oil been changed regularly enough that it likely is not causing gummed valve stems/guides, or lifters that may have sticking check valves?
Have not heard much of the rocker studs moving in the cylinder heads on Kohlers, but comparing the height of all would verify they are in place(or all have moved...).
If it is down on power, you might check fuel availability - pump if equipped, filter, fuel line condition and outflow from the tank. Fuel line can decay internally but look perfect on the outside.
When started and warmed up, will the engine increase rpms without hesitation when you move the control from low to higher rpms?
tom
ADDED: You may get more information/response by posting on a twin cylinder post, or posting with that label. This is labeled for singles.
Have you checked the cooling fins for any sort of blockage such as clippings or nests? Has the oil been changed regularly enough that it likely is not causing gummed valve stems/guides, or lifters that may have sticking check valves?
Have not heard much of the rocker studs moving in the cylinder heads on Kohlers, but comparing the height of all would verify they are in place(or all have moved...).
If it is down on power, you might check fuel availability - pump if equipped, filter, fuel line condition and outflow from the tank. Fuel line can decay internally but look perfect on the outside.
When started and warmed up, will the engine increase rpms without hesitation when you move the control from low to higher rpms?
tom
ADDED: You may get more information/response by posting on a twin cylinder post, or posting with that label. This is labeled for singles.